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发布时间：2025-08-18 17:50:29
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答案：Human blastocyst hatching at 5-6#Human fertilization#Ovulation#As implantation processing, inner cell mass differentiate into two layers:Hypoblast:a layer of small cuboidal cells adjacent to the blastocyst cavityAdjacent to the exocoelomic cavityEpiblast:Thick layera layer of high columnar cells above the hypoblastRelated to the amniotic cavityThe two germ layers form a flat disc shape structure andtogether are called as bilaminar germ disc.#Ectoderm
